'Zabne Pisk Ponya!' is completely meaningless to me, and 'Zamknij usta przyjaciela!' translates into English as 'Close the mouth of your friend!', and is perfectly correct. Where did you come across those?

Ponyal is a Russian word, but I think they may use it sometimes in slang -- in Polish, with the meaning of "understand". "Do you understand" -- to a man, only, "ponyala", would be used referring to a woman. It is not a Polish word, though. Just like "verstanden". I think it is also used in Polish sometimes.